Fiber-optic gyroscope for rotational seismic ground motion monitoring of the Campi Flegrei volcanic area

Author:

Capezzuto Marialuisa1,Gaudiosi Guido2,Nardone Lucia2,D’Alema Ezio3,D’Ambrosio Davide,Manzo Roberto4,Giorgini AntonioORCID,Malara PietroORCID,De Natale Paolo5ORCID,Gagliardi GianlucaORCID,Santamaria Amato Luigi6ORCID,Galluzzo Danilo,Avino SaverioORCID

Affiliation:

1. Università degli Studi della Campania Luigi Vanvitelli

2. Osservatorio Vesuviano

3. Istituto Nazionale di Geofisica e Vulcanologia

4. Complesso Universitario di Monte Sant’Angelo

5. Istituto Nazionale di Ottica (INO)

6. Agenzia Spaziale Italiana

Abstract

The real-time monitoring of densely populated areas with high seismic and volcanic risk is of crucial importance for the safety of people and infrastructures. When an earthquake occurs, the Earth surface experiences both translational and rotational motions. The latter are usually not monitored, but their measurement and characterization are essential for a full description of the ground motion. Here we present preliminary observational data of a high-sensitivity rotational sensor based on a 2-km-long fiber-optic Sagnac gyroscope, presently under construction in the middle of the Campi Flegrei Volcanic Area (Pozzuoli, Italy). We have evaluated its performance by analyzing data continuously recorded during an acquisition campaign of five months. The experimental setup was composed of a digital nine-component seismic station equipped with both a rotational sensor and conventional seismic sensors (seismometers, accelerometers, and tiltmeters). During this experiment we detected seismic noise and ground rotations wavefield induced by small to medium local earthquakes (M D <3). The prototype gyroscope shows a very promising sensitivity in the range of 5×10−7−8×10−9rad/s/Hz over the frequency bandwidth 5 mHz–50 Hz. Future upgrades and perspectives are discussed.

Funder

Italian Space Agency

European Commission;

European Defense Fund

Publisher

Optica Publishing Group

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